A Spy Satellite Is in Circular Orbit Around the Earth

question 77

Multiple Choice

A spy satellite is in circular orbit around the Earth at an altitude of 500 km above ground.What is the satellite's orbital speed,if it makes one revolution every 90 min? (You might want to know that the radius of the Earth is approximately 6400 km) .

• A)1 km/s
• B)2 km/s
• C)4 km/s
• D)8 km/s
• E)16 km/s

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